The Auction House is the main reason why we see so many people walking around with billions of gold. For many out there that were never able to find that one good item and sell it on the AH will obviously have a disadvantage and shortage of gold going into RoS especially since at current, trading/selling good items is forbidden.
The problem I see is that the Mystic is suppose to be a giant gold sink to filter that AH gold out of the economy, yet at the same time the people who have always been broke such as myself barely carrying 20mill at a time will always be scrambling to find some extra gold just to buy potions or gem their new piece of gear.
I strongly believe that there needs to be a GOLD WIPE at the start of the expansion. There is no real reason not to as players aren't really losing anything. The only thing gold was ever used for was to buy things on the AH and since this is no longer a thing, gold will only be used for crating items and using the mystic.
The way I see it is that GOLD drops should become important again. I can't tell you how many hours of streams I watch of people just ignoring stacks of 500+ gold just because it was a waste of time to pick up because they knew the AH was already going to make it up to them.
This makes an even playing field for everyone and permanently fixes all the damage the AH so badly caused. The job is only half finished if you remove the AH but don't remove the AH gold. That is like digging a ditch but forgetting to fill it back up again.